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To glue 2 boards together (Read 2,260 times)
 
Tom Albrecht
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Re: To glue 2 boards together
Reply #15 - Jan 16th, 2016 at 3:39pm
 
The polyurethane glues are really best for exterior projects, and interior projects that need the gap filling abilities.  They expand with moisture.  It's a similar formula to the  "Great Stuff" expanding foam insulation products.
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Don Stephan
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Re: To glue 2 boards together
Reply #16 - Jan 16th, 2016 at 8:34pm
 
When polyurethane glue, and "Great Stuff" expand they become open foam that is easily crushed.  As insulation this is a desirable property, because the trapped air is a good insulator. 

Joints glued with polyurethane need to be well clamped because the glue naturally expands and becomes open foam otherwise, making a very weak joint.
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Ed Weber
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Re: To glue 2 boards together
Reply #17 - Jan 16th, 2016 at 9:09pm
 
Don Stephan wrote on Jan 16th, 2016 at 8:34pm:
When polyurethane glue, and "Great Stuff" expand they become open foam that is easily crushed.  As insulation this is a desirable property, because the trapped air is a good insulator.

Joints glued with polyurethane need to be well clamped because the glue naturally expands and becomes open foam otherwise, making a very weak joint.


One of the reasons I don't use it often.
I think a common misconception is that if the foaming fills the gap the joint can be less than perfect.
I have used poly glue for exterior  repairs (not wood). For wood projects I use Titebond 3.
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Gene Luby
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Re: To glue 2 boards together
Reply #18 - Jan 19th, 2016 at 3:07pm
 
Another trick ,glue both surfaces, I rub the glue in  with my finger to get the glue into the pores, instead of gluing boards face up ,I glue face down, the glue will tend to run down filling any voids in the joint if any, do not over tighten the  clamp pressure ,will squeeze out all the glue weakening the joint
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